:root {
  --ink: #14202b;
  --ink-soft: #4a5b6b;
  --paper: #ffffff;
  --wash: #f1f4f6;
  --rule: #dde4e9;
  --accent: #1f6f5c;
  --accent-soft: #e7f1ee;
  --max: 68rem;
  --measure: 42rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- header ---------- */

.site-head {
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.25rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.brand:hover { text-decoration: none; }

.brand-mark {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 600;
}

.nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

.nav a { color: var(--ink-soft); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 500; }

/* ---------- hero ---------- */

.hero {
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 0 0 1.25rem;
  max-width: 20ch;
}

.hero p {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: var(--measure);
  margin: 0 0 2.25rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.8rem 1.6rem;
  border-radius: 6px;
  font-weight: 500;
  font-size: 1rem;
}

.btn:hover { background: #185a4a; text-decoration: none; }

.btn-quiet {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
  margin-left: 0.5rem;
}

.btn-quiet:hover { background: var(--wash); }

/* ---------- content sections ---------- */

.section { padding: 4rem 0; }
.section + .section { border-top: 1px solid var(--rule); }

.section h2 {
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  font-weight: 600;
  margin: 0 0 2rem;
}

.grid {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.grid h3 {
  font-size: 1.02rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  padding-left: 0.9rem;
  border-left: 3px solid var(--accent);
}

.grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.97rem;
  padding-left: 0.9rem;
}

/* ---------- legal & doc pages ---------- */

.page {
  padding: 3.5rem 0 5rem;
  display: grid;
  gap: 3.5rem;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 62rem) {
  .page.has-toc {
    grid-template-columns: 14rem minmax(0, 1fr);
    align-items: start;
  }
  .toc {
    position: sticky;
    top: 6rem;
  }
}

.toc {
  font-size: 0.92rem;
  border-left: 1px solid var(--rule);
  padding-left: 1.1rem;
}

.toc p {
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--ink);
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.toc a { color: var(--ink-soft); }

.prose { max-width: var(--measure); }

.prose h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  letter-spacing: -0.022em;
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.6rem;
}

.updated {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin: 0 0 2.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.prose h2 {
  font-size: 1.28rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  margin: 2.75rem 0 0.9rem;
}

.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
}

.prose p, .prose li { color: #26333f; }
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose li { margin-bottom: 0.5rem; }

.callout {
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 1.15rem 1.35rem;
  margin: 2rem 0;
  font-size: 0.97rem;
}

.callout p { margin: 0; }

.note {
  background: #fff8e6;
  border: 1px solid #f0dfae;
  border-radius: 8px;
  padding: 1.15rem 1.35rem;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.note p { margin: 0; }
.note strong { color: #7a5b00; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th {
  background: var(--wash);
  font-weight: 600;
}

/* ---------- footer ---------- */

.site-foot {
  border-top: 1px solid var(--rule);
  background: var(--wash);
  padding: 3rem 0;
  font-size: 0.93rem;
  color: var(--ink-soft);
}

.site-foot .wrap {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.site-foot nav {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
}

.site-foot a { color: var(--ink-soft); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}